Flexible cellulose-carbon nanotube paper substrate decorated with PZT: sensor properties
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Flexible cellulose-carbon nanotube paper substrate decorated with PZT: sensor properties Ricardo M. Silva1, Bruno S. Noremberg1, Natália H. Marins1, Jose H. Alano1, Luiza R. Santana1, Antoninho Valentini2, Dariusz Łukowiec3, Tomasz Tański3,4, Neftalí L. V. Carreño1,* 1
Graduate Program in Materials Science and Engineering, Technology Development Center, Federal University of Pelotas, 96010-000, Pelotas, RS, Brazil.
2
Federal University of Ceará, Department of Analytical Chemistry and Chemical Physics, Fortaleza, CE, Brazil.
3
Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Gliwice, Poland
4
Center for Nanotechnology, Silesian University of Technology, Gliwice, Poland
*Correspondent author email: Neftali Lenin Villarreal Carreño ([email protected] or [email protected])
ABSTRACT
Composite of PZT (lead zirconate titanate) and PLZT (lead lanthanum zirconate titanate) along an organic, renewable, conductive, and flexible matrix have been developed. The conductive paper was obtained through the reaction between the cellulose extracted from banana stem and functionalized MWCNT. This reaction was made in the presence of hydrogen (from H2SO4), which reduced the size of the cellulose by acid hydrolysis and promotes the interaction between its hydroxyls and the carboxyl groups of nanotubes. Afterward, the PZT particles were synthesized and grown up on the conductive paper by microwaves-assisted hydrothermal synthesis (MHS). The composite material was characterized by structure and morphology. Moreover, gas-sensing in the presence of methanol and electrical resistance as a function of temperature were also investigated. In this way, a simple, low-cost and successful synthesis was reported. Also, a promising flexible was obtained using a chemical transformation process from banana residue as source of cellulose.
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INTRODUCTION The environment pollution has increased dramatically in the last decades. Due to this, protect the environment became a major modern society concern. In particular, many efforts have been made in the development and improvement of gas sensors devices, which are able to assist in the pure air preservation [1]. The proper selection of materials which will be used in gas sensors is very important. In this context, ceramic lead zirconate titanate (PZT) has been used because of its excellent advantages, such as high sensitivity, wide frequency bandwidth, fast response, and flexibility in relation to its composition modification [2][3]. However, materials consisting of ceramics usually are brittle and fragile, hindering their integration into electronic devices. For this reason, many attempts have been made in order to obtain flexible composites, avoiding a possible breaking of the ceramic incorporated un
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